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8f5b81e6ed
Instead of having a separate CCryptoKeyStore that handles the encryption stuff, just roll it all into CWallet.
116 lines
4.1 KiB
C++
116 lines
4.1 KiB
C++
// Copyright (c) 2009-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_WALLET_CRYPTER_H
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#define BITCOIN_WALLET_CRYPTER_H
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#include <serialize.h>
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#include <support/allocators/secure.h>
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#include <script/signingprovider.h>
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#include <atomic>
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const unsigned int WALLET_CRYPTO_KEY_SIZE = 32;
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const unsigned int WALLET_CRYPTO_SALT_SIZE = 8;
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const unsigned int WALLET_CRYPTO_IV_SIZE = 16;
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/**
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* Private key encryption is done based on a CMasterKey,
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* which holds a salt and random encryption key.
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*
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* CMasterKeys are encrypted using AES-256-CBC using a key
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* derived using derivation method nDerivationMethod
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* (0 == EVP_sha512()) and derivation iterations nDeriveIterations.
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* vchOtherDerivationParameters is provided for alternative algorithms
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* which may require more parameters (such as scrypt).
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*
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* Wallet Private Keys are then encrypted using AES-256-CBC
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* with the double-sha256 of the public key as the IV, and the
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* master key's key as the encryption key (see keystore.[ch]).
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*/
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/** Master key for wallet encryption */
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class CMasterKey
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{
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public:
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std::vector<unsigned char> vchCryptedKey;
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std::vector<unsigned char> vchSalt;
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//! 0 = EVP_sha512()
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//! 1 = scrypt()
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unsigned int nDerivationMethod;
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unsigned int nDeriveIterations;
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//! Use this for more parameters to key derivation,
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//! such as the various parameters to scrypt
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std::vector<unsigned char> vchOtherDerivationParameters;
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ADD_SERIALIZE_METHODS;
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template <typename Stream, typename Operation>
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inline void SerializationOp(Stream& s, Operation ser_action) {
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READWRITE(vchCryptedKey);
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READWRITE(vchSalt);
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READWRITE(nDerivationMethod);
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READWRITE(nDeriveIterations);
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READWRITE(vchOtherDerivationParameters);
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}
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CMasterKey()
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{
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// 25000 rounds is just under 0.1 seconds on a 1.86 GHz Pentium M
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// ie slightly lower than the lowest hardware we need bother supporting
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nDeriveIterations = 25000;
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nDerivationMethod = 0;
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vchOtherDerivationParameters = std::vector<unsigned char>(0);
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}
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};
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typedef std::vector<unsigned char, secure_allocator<unsigned char> > CKeyingMaterial;
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namespace wallet_crypto_tests
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{
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class TestCrypter;
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}
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/** Encryption/decryption context with key information */
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class CCrypter
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{
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friend class wallet_crypto_tests::TestCrypter; // for test access to chKey/chIV
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private:
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std::vector<unsigned char, secure_allocator<unsigned char>> vchKey;
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std::vector<unsigned char, secure_allocator<unsigned char>> vchIV;
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bool fKeySet;
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int BytesToKeySHA512AES(const std::vector<unsigned char>& chSalt, const SecureString& strKeyData, int count, unsigned char *key,unsigned char *iv) const;
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public:
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bool SetKeyFromPassphrase(const SecureString &strKeyData, const std::vector<unsigned char>& chSalt, const unsigned int nRounds, const unsigned int nDerivationMethod);
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bool Encrypt(const CKeyingMaterial& vchPlaintext, std::vector<unsigned char> &vchCiphertext) const;
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bool Decrypt(const std::vector<unsigned char>& vchCiphertext, CKeyingMaterial& vchPlaintext) const;
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bool SetKey(const CKeyingMaterial& chNewKey, const std::vector<unsigned char>& chNewIV);
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void CleanKey()
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{
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memory_cleanse(vchKey.data(), vchKey.size());
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memory_cleanse(vchIV.data(), vchIV.size());
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fKeySet = false;
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}
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CCrypter()
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{
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fKeySet = false;
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vchKey.resize(WALLET_CRYPTO_KEY_SIZE);
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vchIV.resize(WALLET_CRYPTO_IV_SIZE);
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}
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~CCrypter()
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{
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CleanKey();
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}
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};
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bool EncryptSecret(const CKeyingMaterial& vMasterKey, const CKeyingMaterial &vchPlaintext, const uint256& nIV, std::vector<unsigned char> &vchCiphertext);
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bool DecryptSecret(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCiphertext, const uint256& nIV, CKeyingMaterial& vchPlaintext);
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bool DecryptKey(const CKeyingMaterial& vMasterKey, const std::vector<unsigned char>& vchCryptedSecret, const CPubKey& vchPubKey, CKey& key);
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#endif // BITCOIN_WALLET_CRYPTER_H
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